Update the readme with install instructions

readme.md

@@ -4,7 +4,7 @@ This is a clone of the original `fortune` command found on many unix systems
 
 It's primarily an educational project in which i aim to completely reimplement the command.
 
-### Progress
+## Progress
 
 - [x] Print a fortune from a fortunes file
 - [x] Specify a cutoff for what is considered a short fortune (the `-n` flag)
@@ -14,3 +14,28 @@ It's primarily an educational project in which i aim to completely reimplement t
 - [x] Ignore case for the pattern (the `-i` flag)
 - [x] Allow multiple fortune cookie files
 - [ ] Implement the `-f` flag
+
+## Installing
+
+Prerequisites:
+* rust
+* clang
+* pkg-config
+* openssl
+
+Build:
+```sh
+cargo install https://github.com/runebaas/fortune-mod.rs.git 
+```
+
+## Fortune files
+
+Place your fortune files in one of the following locations:
+
+* *nix
+  * /usr/share/fortune
+  * /usr/share/games/fortunes
+  * ./fortunes
+* windows
+  * ./fortunes
+  * ./cookies